The invention relates to a drive device for moving a movable furniture part, in particular a drawer, said drive device acting as a latching and unlatching spring-loaded ejection device for ejecting the furniture part from a closed position in the opening direction and as a spring-loaded refraction device for retracting the furniture part into the closed position. The same spring spring-loads the drive device both when the latter acts as an ejection device and when the drive device acts as a refraction device.
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39. A drive device for moving a movable furniture part, wherein the drive device comprises a spring arranged such that the drive device acts
as a lockable and unlockable spring-loaded ejection device for ejecting the furniture part from a closed position in an opening direction, and
as a spring-loaded retraction device for retracting the furniture part into the closed position,
wherein the spring spring-loads the drive device both in its function as an ejection device and also in its function as a retraction device,
wherein the drive device further comprises a locking element which, in a state in which the locking element is held against an abutment portion, locks the drive device so as to lock the movable furniture part in the closed position,
and wherein the locking element is pivotably mounted such that, in the state in which the locking element is held against the abutment portion and the drive device is locked with the movable furniture part being in the closed position, a pressure applied to the movable furniture part in the closing direction moves the locking element away from the abutment portion so as to unlock the drive device.
38. A drive device for moving a movable furniture part, wherein the drive device comprises a spring arranged such that the drive device acts
as a lockable and unlockable spring-loaded ejection device for ejecting the furniture part from a closed position in an opening direction into a first open position, and
as a spring-loaded retraction device for retracting the furniture part from a second open position in a closing direction into the closed position,
wherein the spring spring-loads the drive device both in its function as an ejection device and also in its function as a retraction device,
wherein the spring has a relief travel,
wherein between the second open position and the closed position the spring passes a first part of the relief travel in which the spring retracts the movable furniture part, the first part of the relief travel corresponding with a retraction spacing of the travel of the movable furniture part from the second open position in the closing direction into the closed position,
wherein starting from the closed position and between the closed position and the first open position the spring passes a second part of the relief travel in which the spring ejects the movable furniture part, the second part of the relief travel corresponding with an ejection spacing of the travel of the movable furniture part from the closed position in the opening direction into the first open position,
wherein the retraction spacing of the travel of the movable furniture part in the closing direction and the ejection spacing of the travel of the movable furniture part in the opening direction at least partly overlap in a part of the retraction spacing which borders the closed position and in a part of the ejection spacing which borders the closed position,
and wherein stress in the spring increases while retracting the movable furniture part in the closing direction.
1. A drive device for moving a movable furniture part, wherein the drive device comprises a spring arranged such that the drive device acts
as a lockable and unlockable spring-loaded ejection device for ejecting the furniture part from a closed position in an opening direction into a first open position, wherein the ejecting of the furniture part starts with the furniture part being in the closed position, and
as a spring-loaded retraction device for retracting the furniture part from a second open position in a closing direction into the closed position,
wherein the spring spring-loads the drive device both in its function as an ejection device and also in its function as a retraction device,
wherein the spring has a relief travel,
wherein between the second open position and the closed position the spring passes a first part of the relief travel in which the spring retracts the movable furniture part, the first part of the relief travel corresponding with a retraction spacing of the travel of the movable furniture part from the second open position in the closing direction into the closed position,
wherein starting from the closed position and between the closed position and the first open position the spring passes a second part of the relief travel in which the spring ejects the movable furniture part, the second part of the relief travel corresponding with an ejection spacing of the travel of the movable furniture part from the closed position in the opening direction into the first open position,
wherein the retraction spacing of the travel of the movable furniture part in the closing direction and the ejection spacing of the travel of the movable furniture part in the opening direction at least partly overlap,
and wherein in a state in which the drive device is locked with the movable furniture part being in the closed position, unlocking of the drive device is triggered by applying pressure to the movable furniture part in the closing direction.
2. The drive device according to
3. The drive device according to
the spring in the closed position of the furniture part has a first medium spring stress between the first part of the relief travel and the second part of the relief travel,
after ejection of the furniture part and relief of stress along the second part of the relief travel the spring has a second, substantially relieved spring stress at a given ejection spacing after leaving the closed position,
upon closure of the furniture part the spring is stressed along the stressing travel and at a given retraction spacing before reaching the closed position, reaches a third spring stress which is increased in relation to the first spring stress, and
starting from the third spring stress with stress relief along the first part of the relief travel and automatic retraction of the furniture part, the spring is relieved into the first spring stress.
4. The drive device according to
5. The drive device according to
6. The drive device according to
7. The drive device according to
a first base element and a second base element which are movable relative to each other in the opening direction and the closing direction, respectively, of the movable furniture part;
a control element which is mounted movably on the first base element, the spring acting on the control element as a force storage means; and
a locking element connected to the control element, wherein the control element is guided with the locking element in a portion of a locking and unlocking path,
wherein a drive element for the second base element is arranged on the control element,
wherein the second base element has a guide path for the drive element, and the guide path
has an ejection portion in which the second base element is movable relative to the first base element in the opening direction of the movable furniture part by the drive element,
has a free-running portion in which the drive element is freely movable in the opening direction,
has a stressing portion in which the drive element is movable in opposition to a spring force of the spring acting on the control element, and
has a retraction portion in which the drive element moves the second base element relative to the first base element in the closing direction of the movable furniture part with partial stress relief of the spring,
wherein the ejection portion of the guide path, the locking element and the drive element with the spring forms the lockable and unlockable ejection device, and the retraction portion of the guide path with the drive element and the spring forms the retraction device,
and wherein
the spring is relieved in the ejection portion from the first medium spring stress to the second spring stress,
the second spring stress remains substantially the same in the free-running portion,
the spring is stressed from the second spring stress to the increased third spring stress in the stressing portion, and
the spring is relieved from the third spring stress to the first spring stress in the retraction portion.
8. The drive device according to
9. The drive device according to
10. The drive device according to
a first base element and a second base element which are movable relative to each other in the opening direction and the closing direction, respectively, of the movable furniture part;
a control element which is mounted movably on the first base element, the spring acting on the control element as a force storage means; and
a locking element connected to the control element, wherein the control element is guided with the locking element in a portion of a locking and unlocking path,
wherein a drive element for the second base element is arranged on the control element,
wherein the second base element has a guide path for the drive element, and the guide path
has an ejection portion in which the second base element is movable relative to the first base element in the opening direction of the movable furniture part by the drive element,
has a free-running portion in which the drive element is freely movable in the opening direction,
has a stressing portion in which the drive element is movable in opposition to a spring force of the spring acting on the control element, and
has a retraction portion in which the drive element moves the second base element relative to the first base element in the closing direction of the movable furniture part with partial stress relief of the spring,
and wherein the ejection portion of the guide path, the locking element and the drive element with the spring forms the lockable and unlockable ejection device, and the retraction portion of the guide path with the drive element and the spring forms the retraction device.
11. The drive device according to
12. The drive device according to
13. The drive device according to
14. The drive device according to
15. The drive device according to
16. The drive device according to
17. The drive device according to
18. The drive device according to
19. The drive device according to
22. The drive device according to
23. The drive device according to
24. The drive device according to
25. The drive device according to
26. The drive device according to
27. The drive device according to
28. The drive device according to
29. The drive device according to
30. The drive device according to
31. A drawer extension guide for a movable furniture part in the form of drawer with a drive device according to
32. The drawer extension guide according to
a drawer rail;
a carcass rail; and
a first base element and a second base element which are movable relative to each other in the opening direction and the closing direction, respectively, of the movable furniture part,
wherein the first base element is arranged on the carcass rail and the second base element is arranged on the drawer rail.
33. An article of furniture comprising:
a furniture carcass;
a movable furniture part; and
the drive device according to
34. The article of furniture according to
wherein the first base element is arranged on the movable furniture part, and the second base element is arranged on the furniture carcass.
35. The article of furniture according to
wherein the movable furniture part is a drawer, and the first base element is arranged on an underside of a bottom of the drawer,
and wherein the second base element is arranged on the carcass rail.
36. The article of furniture according to
wherein the first base element is arranged on the furniture carcass, and the second base element is arranged on the movable furniture part.
37. The article of furniture according to
wherein the first base element is arranged on the carcass rail and the second base element is arranged on the drawer rail, the drawer rail being associated with the movable furniture part.
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The invention concerns a drive device for moving a movable furniture part, in particular a drawer. The invention further concerns a drawer extension guide having such a drive device and an article of furniture having such a drive device.
So-called touch-latch mechanisms for movable furniture parts such as drawers, drop doors and so forth have already been known from the state of the art for some time. They involve automatic opening of the movable furniture part after pressure is applied to the movable furniture part in the closing direction by a user. Separate switches which perform such an opening movement are sometimes also provided. That extra pressure applied to the movable furniture part triggers the ejection device, whereupon the movable furniture part is ejected from the furniture carcass in the opening direction by a force storage means being released. In most cases corresponding ejection devices are disposed beneath the drawer bottom or behind the drawer.
Mechanisms which facilitate or improve closing of a movable furniture part have also been known from the state of the art for some time. In that respect there are various versions of retraction devices by which a movable furniture part is automatically pulled in over the last region of the closing movement (generally a few centimeters) so as to guarantee that the drawer or the movable furniture part is securely closed.
An example of a publication showing both an ejection device and also a retraction device is WO 2007/028177 A1 to the present applicant. Two Figures originating from that specification are shown in the present specification as
A disadvantage with that known construction is that two separate, independent and costly structural units have to be provided in the region of an extension guide in order thereby to be able to perform on the one hand ejection and on the other hand retraction. In addition, in the state of the art, it is often relatively complicated to provide for stressing of the springs without a user noticing that as a difficulty when producing the movement upon opening or closing.
The object of the invention is to provide a drive device which is improved over the state of the art. In particular the invention seeks to provide that the ejection device and the retraction device are combined as much as possible into one structural unit so that fewer components are required.
That object is attained in conjunction with the features of the classifying portion of an aspect of the invention, in that the drive device acts on the one hand as a lockable and unlockable spring-loaded ejection device for ejecting the furniture part from a closed position in the opening direction, and on the other hand as a spring-loaded retraction device for retracting the furniture part into the closed position, wherein the same spring spring-loads the drive device both in its function as an ejection device and also in its function as a retraction device. By virtue of such a design configuration the spring provides both for acting to produce the ejection movement of the ejection device and also acting to produce the retraction movement of the retraction device. In that respect the spring can be in the form of a compression or a tension spring. In that respect the term spring also embraces force storage means in the form of gas ressure springs. Basically the spring can also be in the form of a magnetic spring.
To implement a stressing process that is as simple as possible for the ejection device and the retraction device, it can preferably be provided that the spring can be stressed along a stressing travel upon opening or closing of the movable furniture part and has a relief travel, wherein the spring retracts the movable furniture part in a first part of the relief travel and ejects the movable furniture part in a second part of the relief travel. With that arrangement it is no longer necessary—as in the state of the art—to find a possible way of providing two matching stressing travels for the spring of the retraction device and for the separate spring of the ejection device.
In the present invention therefore the precise arrangement and configuration of the invention can be per se any desired arrangement and configuration as long as stressing of the spring necessitates only one stressing travel of which the stress relief energy can be used in regard to one part for retraction and in regard to the other part for ejection.
It is preferably provided however that the spring is in the form of a single spring. That affords substantial simplification and a reduction in the space required. As an alternative option however the possibility of the spring being in the form of a spring pack should not be excluded. That permits different adaptations so that a part of the spring pack deploys its stress relief action to a particularly great degree for example upon ejection while a further part of the spring pack which is preferably simultaneously loaded causes the stress relief energy to act in the closing direction of the movable furniture part relatively slowly and gently during the retraction movement. It is essential that the springs of the spring pack are stressed during a common stressing operation, in which respect however the beginning and the end of the stressing of the individual springs or the parts of the spring pack can differ. It can preferably be provided that the individual springs of the spring pack are connected in mutually parallel relationship.
To permit the spring that double function with so-to-speak oppositely directed retraction and ejection movements, it can preferably be provided that the spring in the closed position of the furniture part has a first medium spring stress, after ejection of the furniture part the spring has a second, substantially relieved spring stress at a given ejection spacing after leaving the closed position, upon closure of the furniture part at a given retraction spacing before reaching the closed position the spring reaches a third spring stress which is increased in relation to the first, and starting from the third spring stress with stress relief and automatic retraction of the furniture part the spring is relieved to the first spring stress. In that way an ejection travel (second relief travel) in which the furniture part can be ejected is available to the spring, from the medium spring stress. Upon retraction the spring is stressed to a spring stress which is above the medium spring stress (stressing travel), whereupon in the last closing portion the furniture part is automatically pulled in by the spring being relieved of stress from the highest spring stress to the medium spring stress (first relief travel).
It can particularly preferably be provided that the retraction spacing is less than the ejection spacing. That provides that retraction takes place during a relatively short travel distance while the ejection travel is relatively long so that ejection does not occur excessively abruptly.
It can further particularly preferably be provided that the stressing travel is longer than the second part of the relief travel. That is the case in particular when the stressing angle is relatively shallow, whereby the spring is stressed easily and almost unnoticed by the user.
As upon unlocking of the movable furniture part or applying increased pressure thereto, the movable furniture part is further moved in the closing direction for a short time before the closed position, it can preferably be provided that the spring has a fourth spring stress which is slightly increased in relation to the third, upon unlocking of the ejection device.
To make the retraction movement gentler and softer there is preferably provided a damping device for damping the retraction movement of the retraction device. As the damping device acts in the opening direction of the furniture part the retraction force and the locking force should exceed the force of the damping device, that is acting in the opposite direction. The damping device guarantees that the retraction process does not take place excessively abruptly and loudly but gently and quietly.
To permit use of a single spring both for the ejection device and also for the retraction device in a structurally simple fashion it can preferably be provided that the drive device has a first base element and a second base element which are movable relative to each other in the opening direction and the closing direction respectively of the movable furniture part, a control element which is mounted movably, preferably pivotably, on the first base element, the spring which acts on the control element, and a locking element connected to the control element, wherein the control element is guided with the locking element in a preferably cardioid-shaped portion of a locking and unlocking path and a drive element for the second base element is arranged on the control element, wherein the second base element has a guide path for the drive element and said guide path has an ejection portion in which the second base element is movable relative to the first base element in the opening direction of the movable furniture part by the drive element, has a free-running portion in which the drive element is freely movable in the opening direction, has a stressing portion in which the drive element is movable in opposition to the spring force of the spring acting on the control element, and has a retraction portion in which the drive element moves the second base element relative to the first base element in the closing direction of the movable furniture part with partial stress relief of the spring, wherein the ejection portion of the guide path, with the control element, the locking element and the drive element and the spring forms the lockable and unlockable ejection device and the retraction portion of the guide path with the control element, the drive element and the same spring forms the retraction device.
In other words the spring acts on a control element which controls the ejection movement and the retraction movement of a movable furniture part in relation to the furniture carcass. In that respect the first and second base elements respectively represent the furniture carcass and the movable furniture part, wherein the first base element can be mounted to the movable furniture part and the second base element can be mounted to the furniture carcass and vice-versa. In addition it is important in that respect that provided in the region of the second base element is a guide path with which the control element cooperates by way of a drive element. The most important portions in such a guide path are the ejection portion, the stressing portion and the retraction portion.
In a particularly preferred embodiment of the invention it can be provided that the spring is relieved in the ejection portion from the medium spring stress to the second spring stress, the relieved spring stress remains substantially the same in the free-running portion, the spring is stressed from the relieved spring stress to the increased spring stress in the stressing portion, and the spring is relieved from the increased spring stress to the first spring stress in the retraction portion. This therefore clearly shows the logical connection between the individual spring stresses and the guide path portions.
In a preferred embodiment of the invention it can be provided that the control element is mounted pivotably to the first base element. Alternatively the control element could also be mounted linearly movably. To limit the movement of that control element it can preferably be provided that the control element has a limiting projection which limits the movement of the control element between two abutments which are preferably in the first base element. In that way the control element can be moved between two abutments with stressing and stress relief of the spring.
If the locking and unlocking mechanism of the ejection device is also to be completely integrated into the drive device, then the locking and unlocking path for the locking element, which path has a cardioid-shaped portion, should be provided in the first base portion.
In regard to stressing of the spring it can be provided on the one hand that the guide path in the stressing portion moves the drive element upon closure of the movable furniture part in opposite relationship to the spring force of the spring. On the other hand the drive element could already pass into a stressing portion for stressing the spring upon opening or ejection of the movable furniture part.
As the entire drive device should be relatively compact it is necessary for the first base element and the second base element also to be able to move freely without influencing each other. That is particularly desirable between the approximately half open position of the drawer and complete opening of the drawer. In order however in that respect to guarantee that the drive element does not pass into the wrong guide path when leaving the region with the guide portions and when passing again into the region with the guide portions, it can preferably be provided that the second base element has a preferably spring-loaded movement switch which allows the opening movement of the drive element from the free-running portion into a further completely free free-running portion and which guides the drive element from the further free-running portion into the stressing portion in the closing movement. For that purpose it is possible to provide for example an inclined deflection means or a movement switching spring.
To be able to connect the control element on the one hand to the guide path for retraction and ejection and on the other hand to the locking and unlocking path for the locking element and to be able to coordinate same a preferred embodiment provides that the locking element is mounted pivotably to the control element.
For an optimum stressing operation and retraction operation in respect of the spring it can preferably be provided that the ejection portion extends substantially transversely relative to the opening direction, the free-running portion extends substantially in the opening direction, the stressing portion has at least region-wise an angle between 5° and 70°, preferably between 15° and 50°, relative to the opening direction, and the retraction portion has at least region-wise an angle between 130° and 175°, preferably between 140° and 165°, relative to the opening direction. For that purpose it can further be provided that at least one of the portions of the guide path extends at least partially in a curve. The precise configuration of those stressing and relief paths can lead to a soft and gentle, fast and/or easily implementable manual movement of the movable furniture part, in which case—without the user noticing it—all spring stressing processes are implemented by the manual movement on the part of the user. Accordingly: the smaller or shallower the angle of the stressing portion, the correspondingly easier can the stressing operation be performed.
Particularly preferably the curved shape of the stressing portions can be such that the transition between the stressing portion and the retraction portion corresponds to the retraction spacing and there the spring reaches the highest spring stress. In that case the stressing portion and the retraction portion form so-to-speak a hill, at the highest point of which the spring is most heavily stressed and the spring is relieved of stress after passing beyond that point and in that case retracts the movable furniture part by pressing the drive element against the retraction portion. In other words that hill shape can be described by the stressing portion and the retraction portion being spaced from the free-running portion in transverse relationship to the opening direction, wherein the greatest spacing of both portions with respect to the free-running portion is at the given retraction spacing.
There are essentially two possible design configurations for the present invention. The first design configuration provides that the first base element is associated with the movable furniture part and the second base element is associated with a furniture carcass on or in which the furniture part is movably mounted. In that embodiment it is preferably provided that the locking element is formed integrally with the drive element. Accordingly that preferably integral component is displaced on the one hand in the locking and unlocking path and on the other hand in the individual portions of the guide path for the drive element. In addition in that respect it can preferably be provided that the spring is in the form of a leg spring, wherein one leg acts on the first base element and one leg acts on the control element.
The second possible design configuration of the present invention provides that the first base element is associated with a furniture carcass and the second base element is associated with the movable furniture part. In this embodiment it can preferably be provided that the limiting projection forms the drive element. In that way the limiting projection is additionally used to apply the spring force of the control element by way of the drive element or the limiting projection to the ejection portion and thus to eject the furniture part.
Protection is claimed for a drawer extension guide for a movable furniture part in the form of a drawer, having a drive device according to the invention. In that respect it can preferably be provided that the second embodiment of the present drive device is arranged on or fixed to the drawer extension guide. In that arrangement the drawer extension guide can have a drawer rail and a carcass rail, wherein the first base element is arranged on the carcass rail and the second base element is arranged on the drawer rail.
Protection is further claimed for an article of furniture comprising a furniture carcass and a movable furniture part, wherein the furniture part can be retracted and ejected by a drive device according to the invention.
In the first embodiment of the drive device described herein it can be provided in that respect that the first base element is arranged on the movable furniture part, preferably at the underside of a drawer bottom, and the second base element is arranged on the furniture carcass, preferably on a carcass rail of a drawer extension guide, that is fixed to the furniture carcass.
If the drive device is in the form of the second embodiment then the first base element is arranged on the furniture carcass, preferably a carcass rail of a drawer extension guide, that is fixed to the furniture carcass, and the second base element is arranged on the movable furniture part, preferably on a drawer rail of the drawer extension guide, that is associated with the furniture part.
Further details and advantages of the present invention are described more fully hereinafter by means of the specific description with reference to the embodiments by way of example shown in the drawings, wherein
Shown in the upper region of
In
In
In
If as shown in
If as shown in
In
That point is reached in
Accordingly
That overall force-travel diagram in
Corresponding thereto
In comparison with the first embodiment of the present drive device 10
In
The locking element 17 is unlocked by applying an increased pressure to the drawer 11 in the closing direction SR and the spring 12 is in the condition of slightly increased spring stress 2 (see
In
In
In that region the movable furniture part 11 or the second base element 15 can be freely moved in the opening direction OR while the spring 12 is further disposed in the relieved spring stress 4 (
Upon the movement of the furniture part 11 in the closing direction (see
In
As soon as the highest point of the stressing portion C has been passed the drive element 20 passes into the region of influence of the retraction portion D, in which the spring 12 contracts, with pivotal movement of the control element 16, and in that case moves the second base element 15 in the closing direction SR relative to the first base element 14, in which case that movement can be damped by the damping device 13. Thus in this second embodiment and therein as shown in
In
The spring 12 (compression spring) is fixedly connected at one end to the mounting plate 62 by way of the mounting elements 10m. At the other end the spring 12 is connected to a guide projection 10n which in turn is guided in a guide path 10k in the mounting plate 62. In addition the spring 12 is connected by way of the guide projection 10n to the ejection lever 10a which in turn is pivotable about the fixed pivot axis 10g connected to the mounting plate 62. At the right-hand lower end the ejection lever 10a has a pressure roller 10b which is in contact in the slightly inwardly displaced region between the contact lever 54a and the stressing cam 54d. In that closed position SS the force of the spring 12 presses against the stressing cam 54b by way of the pressure roller 10b. Since as a further consequence force is applied to the locking lever 17a by way of the holding nose pin 17k the articulated lever pin 17j is urged upwardly in the closed position SS to such an extent as is allowed by abutment of the holding nose 17b against the locking projection 17e.
If now—as shown in
Due to the unlocking action the articulated lever passes into the completely inwardly displaced position shown in
As a result the open position OS is reached as shown in
After the spring 12 has been completely relieved of stress (as in
If now the furniture flap is further moved in the opening direction OR (see
In
That stressing continues until the pressure roller 10b has reached the highest point on the stressing cam 54d and passes into the retraction portion E. Upon reaching that retraction portion E the spring 12 can be slightly relieved of stress (movement from
A synchronization bar can be fixed in the region of the ejection pivot axis 54e to transmit the rotary movement to a preferably mirror-symmetrical lever mechanism on another side of the furniture carcass 26.
A fourth embodiment of the present invention is shown in
If now the movable furniture part 11 and therewith the entrainment member 44 is moved from the position in
Upon further movement in the closing direction (
That retraction movement is effected until the locking slider 46 and its second locking projection 48 has reached the locking position in
If now as shown in
By virtue of relief of the spring 12 the locking element 17 and by way of its limiting abutment 50 the entrainment member 44 and thus the movable furniture part 11 are actively ejected and reach the position shown in
After the entrainment member 44 has reached the position shown in
As soon as the entrainment member 44, in that movement, reaches the right-hand limiting abutment 50a of the locking element 17 (see
In principle it should be stated in relation to this fourth embodiment that the drive device 10 could also be associated with the movable furniture part 11 and in contrast the entrainment member 44 could be associated with the furniture carcass 26. The damping device 13 does not have to be in the form of a rotational damper but for example can also be in the form of a fluid damper. The damping device 13 however can also be omitted whereby the spring force F of the spring 12 acts undampedly on the movable furniture part 11.
Thus all embodiments of the present invention present a drive device 10 which is substantially improved and simplified over the state of the art and which is both in the form of an ejection device 8 and also a retraction device 9, wherein the same spring 12 functions as a respective force storage means for retraction and ejection. It will be appreciated that the possibility should not be ruled out that two springs 12, 12a which are parallel or which also act in different directions on the drive element 20 are provided in the drive device 10. What is essential is that this at least one spring 12 serves for retraction during a part of its relief travel EW1 and serves for ejection during a further part of the spring relief travel EW2. The possibility should also not be ruled out that—depending on the respective configuration—the spring relief travel EW1 from the highest spring stress 7 to the medium spring stress 1 serves for ejection while further stress relief EW2 from the medium spring stress 1 to the relieved spring stress 3 serves for retraction.
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